Dave,
I have just found an old movie. The fighters were not US or UK but French. you will note the tail markings are a bit different to the usual British ones.
The aircraft were transferred in Morocco from the 33 Fighter Group USAAF to GC11/5, a French squadron associated with the WW1 French/American Lafayette Escadrille. The American ground crews stayed with them for some time until the French crews were trained up.
More Packard Merlin p-40's were operated by the Americans than anyone else so that engine does not denote ownership.
Lang
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